Ness Digital Engineering interview questions

The interview was very short process, they took 3 round all technical. Finally one guy came out and said me to you may leave i will send you offer letter on either Monday or Tuesday..... I said that's fine and i left. I was waiting for their response to come then on thursday i called one guy and ask about the same and what they replied was surprising they said "Hr feedback was not positive". I disconnected the call immediately. i don't know why these companies waste other time. I was waiting for process from since morning and finally it was done at evening 6 PM.